JLo in a head wrap. I remember my grandma used to do this. On the day before she washed her hair, she would drench it in olive oil. slick it back in a low bun, wrap her hair with plastic wrap, then put a beautiful head wrap on. She'd throw on her big gold hoops and shades and walk out the door. She always looked so chic! She'd leave it all day, and then that night she would wash it. She had the softest, shiniest hair.